Dies for manufacturing seamless tubes.



E. F. HOLINGER. DIES FOR MANUFACTURING SEAMLESS TUBES. APPLICATION FILED NOV.6,1913.

1 1 22,753, Patented Dec. 29, 1914 4 SHEETS'SHEET 1.

E. F. HOLINGER. DIES FOR MANUFACTURING SEAMLESS TUBES. APPLICATION FILED NOV. 6, 1913 1,122,753. Patented Dec. 29, 1914.

4 SHEETS"SHEET 2 WITNESSES INVENTOR E. P. HOLINGER. DIES FOR MANUFACTURING SEAMLESS TUBES.

APPLIOATION FILED NOV. 6. 1913.

Patented Dec. 29, 1914 4 SHEETS-SHEET 3.

INVENTOH B. F. HOLINGER.

mns FOR MANUFACTURING smmsss 'IUBFS APPLIOATIONHLEDNOVA).19134 Patented Dec. 29. 1914,

4 SHEETS SHEET;v F1712 III/1 Mum 5 UNITED STATES PATENT ()FEICE."

EMIL F. HO INQEK, 0F MCKEESPOET, PENNSYLVANIA.

DIES F01!y MANUFACTURING SEAMLESS TUBEN 1 ,t22,753. Specification of Letters Patent Pa tented Dec. 29, 1914. Original application filed June 11, um, Serial No. 773.014. Divided and this application filed November e',191s. Serial No. 799,486.

To all whom, it may concern:

Be it known that Lilian!) F. Honn orza, 'a citizen of the United States, res ding at Mclicesport, in the countyof Allegheny llcretofore, the metal plates or blanks which were shaped by dies into seamless tu 1cs\\'crc cut-'or stamped out of sheet metal by circular dies.

It is one of the objects of my'invention to ut lize a largerpercentage of each of the plates from which the'blanks are stamped than is utilized by, making theblanks circular. I prefer to make the plates or blanks square with rounded corners. I subject the rounded cornered square blanks to cupping operations in rings or dies with correspond ingly shaped "openings, the successive dies having their openings gradually assuming a circular shape. Heret'ofore, the cupping;v rings or dies havehad even circular openings. but I prefer to make some ofthe rings or (lies with the edges of theopenings therein lluttd or scalloped in order to increase the reduction of the diameter. and wall thickness of the cups, and to'produce a lateral flow of the metal in each alternating die, referring: specially to the operations where reduction of the wall thickness is accomplished. This lateral flow of the metal improves the structure of the material above what would take place. if only circular dies were used.

Referring to theaccompanying drawings, Figure 1 is a perspective view showing the dies by which my improved blanks are stamped from square sheet metal. Fig. 2 is a. perspective .view, on a larger scale than Fig. 1, of one of my blanks with the severed corners in their original places. Fig. 3, a perspective partly in section showing one of my blanks located on the rim: die and below the punch ready for the first cupping operation. Fig. 4. a pers ective of the cup or tube produced by the'dies shown on Fig. 3. Fig. 5,"a perspective partly in section showing the cup of Fig. 4 seated in the second ring ready for the second cupping open ation. Fig. 6, a perspective of -the cup or tube produced by the dies shown on Fig. 5.

Fig. 7, perspective views of a series of'ring dies through which the cup allOVl'l in Fig. 6 is successively pushed, thepunch' and the cup before passing through the firstrlng being shown at the left of the first die, and the cup after passing through all-the rings being shown at the right of the last die. Fig. 8, a vview like Fig. 7, but illustrating the cupping operations continued with a smaller 1 rings with still smaller openings. Fig. 10 is a vertical section of the ring dies shownon Fig. 7 assembled in a holder also in vertical section, the punch therefor being in side elevation and broken awayjat its upper end. Fig. 11 is a verticalsection'of'the ring. I

dies shown on Fig. 8 assembledina holder also in "vertical section, the'p'unch therefor being in side elevation and broken away at V 4 its upper end. Fig. 12 isaview similar in character to Figs. 10 and 11. but-showing its ring dies and thepunchshown in Fig. 9

together with the holder for the ring dies. Fig. 13 is a section on the line A'A on Fig. 10.

On the drawings, 1 represents the lower or ring member of the cutting or stamping dies by which my improved blank is cut from a plate of sheet metal, and 2 is the up per or punch member of'the said dies. The die opening in the ring member has its source rounded,and its sides between the rounded corners conforming,to the sides of a square, that isto sav, thedi opening is a square with rounded corners. The punch member 2 is shaped to correspond to the opening in the ring member.

3. 3 are two gagelue's on theupper face of the ring member, the lugs-being at adjacentv sides of the die opening and flush with the walls of the die opening.

A square plate mav-be laid on the die member 1 with its adjacent edges against the gage-lugs? The remaining two edges of the plate will register with the two remaining sides of the die opening. WVhen the punch member pas es through the ringz member. the earners of the plate are cut 06. Fig. 2 shows t eplate with the severed corners 4 in their original positions with rethrough the die 6.-by the punch 7, 'itbecomes' the cup or short tube 8, shown in Fig. 4. The lower end of the punch 7 is half-spherical, so that it produces a cup with a halfspherical bottom, but gradually assuming.

, upwardly a square round cornered shape or section at its top. Thisis done in order to take care of the metal at the rounded corners of the nearly square plate so as to produce a cup with an even edge. In Fig. 5,

v the cup 8 is shown seated in the ring or die 9. somewhat smaller than the ring or die 6. The punch or male die 10 forces the cup '8 through the die 9 and produces the tube or cup 11, shown in 6. The cup 11 is somewhat longer than the cup 8 and has a. smaller crossscction, butit'still preserves its rounded bottom and square round cornered edge. In the next operation ind icated by Fig. 7, the elongated cup 11 is forced successively through ,the seven ring dies 0 to (which number may be larger or smaller) by the punch or male "die 12, whereby the still more elongated ciip or tube 13 isproduced The rings-ato gareas'sembled in regul'arorder in the vertical :holder 18 provided with the slots 21 to receive the same and areso madethat the opening in each succeeding ring", which is smaller than the preceding ring, approaches more and more a circular shape. the last ring, 9, be

coming preferably entirely or nearly circu lar. In the elongating operation shown bv Fig. 7. practically no reduction of the wall thickness is accomplished, the cup being merely elongated and reduced in diameter, in order to bring it intothe shape of a tube suitable for subseouent drawing and wall reduction, "especially for changing the square round cornered cup intoa-cup with a circular cross-section or edge. The die a has a slightly smaller'opening than the (lie 9. In the next operation, shown in Fig. 8, the cup or tube '13 is forced by the m zit} die or punch 14 through the rings or dibs hto k, which-are arranged in regular orderin the slots 22 in,the holder 19 and successively smaller and smaller, thereby producing the considerably longated cupor tube 15, the opening in the ring it being smaller than the opening in the ring 9. In the next operation shown in Fig. 9, the tube 15 is forced by the punch or male die 16 through the rings Z and m, whereby the still more elongated tube 17 is produced, the opening in the ring 2 being smaller than that in the ring is, and the opening in the ring on being smaller than that in-th ring I.

A novel feature, an improvement in hot drawing, is introduced into the operations shown in Figs. 7, 8, and '9. It will be noticed that every other ring, that is, the rings 6, d, f, h, j, and l, is scalloped or fluted. This is done in order to increase the reduc tion of the tubes or cups and to produce a kneading action which acts laterally on the material and improves the structure. ,It has been found in practice that, in'reducing the wall thickness of a tube by hot drawing, it the metal can be prevented from gathering, or piling on itself in front of the rings, a considerable increase in reduction of diameter or wall thickness, as the case may be, canbe accomplished. The prevention of this gathering or piling of the metal in front of the rings is accomplished by internally scalloping 0r fiuting the alternate rings. The tube to be reduced being pushed througha scalloped or fluted ring is-corrugated longitudinally and considerably reduced in diameter or wall thiclrhess.or both, the reduction being more than would result by pushing the tubef through a plain ring. When the tube, which has.been sca.lloped .or fluted by one. die, is. pushed {through the next die which is plain, thatis','not scalloped or fluted. a plain SmOOthZQtllbQ' isagain prm duced. This smooth tube is "pushed through the succeeding seanupea a 1 fluted ring. The tubes are forcedthrough-thealternately scalloped and smooth rin-gsfuntil z the 'desired reduction and elongationihave' been secured,

and in addition, -a .su'perior'structure has been produced through-the lateralispreadin of the metal, or kneading action of the seal loped or fluted dies. 5

. One gain in my invention over the pres ent practice of beginning the-operation with a circular blank is in utilizing more of the. material from which the blank is cut. The loss of material in rounding the corners of a square plate to produce my blank 5 amounts to approximately 73%, whereas the loss by the production of circular blanks amounts to 21.46%, so that I convert 92% of a square plate into atr bewhile by .the present practice only 78.54% of a square plate is converted into a'tube. Another gain is accomplished by increasing the reduction per ring, or per series of rings, on account of the scalloped or fluted rings. By my im provement I can produce a hot drawn tube of a given length and diameter in fewer operations than is accomplished by the present practice. Furthermore, by the lat eral force of the metal'produced by the sealloped or fluted dies, I produce a tube whose structure is superior to what isaccomplished in practice with ordinary plain circular 'l his application is a di vision. of my application, Serial Number 773,03 :1, tiled June 11, 1913.

I do not limit my invention to any defil nite number of drawing operations or to any definite number of dies per operation.

I claim-- 1. In apparatus for the manufacture of tubing by cupping operations, a series of ring (lies, the openings in the (lies being successively smaller and alternate (lies of the series having their openings scalloped or fluted.

2. In apparatus for the manufacture of tubing by cupping operations, a of (lies with square round cornered openings, the openings in the (lies being successively smaller, and one or more male (lies or forcing a blank, initially a square with rounded corners, through the said openings in the (lies.

3. In apparatus for the manufacture of tubing by cupping operations, a series of ring dies, having successively smaller open-- ings, the first die of the series having a square round cornered opening, the (lies having their openings successively approximatcly more and more a circular outline.

4. In apparatus for the manufacture of tubing by cupping operations. a series of ring (lies, havin successively smaller open ings, the first ie of the series havin a square round cornered openin the ice having their openings successive y approximanly more and more a circular outline, and some of said dies having their openings scalloped or fluted.

ii In apparatus for the manufacture of tubing by cupping operations, a series of ring dies, having successively smaller open lugs, the first die of the series having a. square round cornered opening, the dies having their openings successively appr0ximating more and more a circular outline, and alternate ones of said dies having their openings scalloped or fluted.

6. ln apparatus for the manufacture oftubing by cupping operations, a series of ring (lies. having: successively smaller openings, the first die of the series havin a square round cornered opening, the es having their openings successively approxr mating inore an l more a circular outline, others of said dies having their openings circular.

Signed at Pittsburgh, Pa, this 5th day of November. lilltl.

EMIL P. HOLINGER.

Witnesses Amen lu. DUFF, F. BARBER. 

